Place the sticky rice in a mixing bowl or another deep container. Add enough water so the level sits at least 7.5 cm above the rice, as the grains will expand while soaking.
Soak for 6 to 24 hours. For a softer texture, soak longer.
Drain (there's no need to shake off excess water), then spread the soaked sticky rice evenly on a heatproof rimmed plate or in a bamboo steamer lined with parchment paper.
Cover and steam for 30 to 45 minutes. For larger batches, steam in two batches or extend the steaming time. Check for doneness and increase the time as needed.
Keep the sticky rice in the steamer, or covered, to prevent it from drying out until serving or using in a recipe.